Most shooting galleries I’ve seen at fairs in the last twenty years used 4.4mm Haenel ball-firers (Holland -won a big cuddly toy), Gat “rifles” with corks, Gamo Meteor Mk7s, Chinese B2s (the last two with deliberately mis-set sights and/or deliberately damaged rifling/crown). And those Tommy gun things that can never quite shoot out the paper star target.